The most relevant response that accurately captures the similar environmental and cultural impacts of the Aztec and Inca is:
They both altered their environment for farming and introduced language.
Both civilizations developed innovative farming techniques such as chinampas for the Aztecs and terracing for the Incas to adapt to their environments. Additionally, while each had their own distinct languages (Nahuatl for the Aztecs and Quechua for the Incas), they contributed to the cultural richness of their respective regions.